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Biology is the only science in which multiplication means the same thing as division.

Google Groups: comp.std.unix
Finding physical memory size
Eric Schnoebelen
1/2/91
(...)
Biology is the only science in which multiplication means the same thing as division.

Google Groups: rec.humor
science jokes (6/11)
Joachim Verhagen
6/26/95
(...)
“Biology is the only science in which multiplication means the same thing as division.”

Google BooksSpeaking of Science:
Notable Quotes on Science, Engineering, and the Environment
By Jon Fripp, Michael Fripp and Deborah Fripp
Eagle Rock, VA: LLH Technology Pub.
2000
Pg. 16:
Biology is the only science in which multiplication means the same thing as division. — Anonymous

Google BooksNaturally Speaking:
A Dictionary of Quotations on Biology, Botany, Nature and Zoology
By C.C. Gaither and Alma E Cavazos-Gaither
London: Institute of Physics Publishing
2001
Pg. 60:
Biology is the only science in which multiplication means the same thing as division.
Source unknown

Google BooksLaboratory Manual for
Postlethwait and Hopson’s Explore Life
By Doreen Schroeder
Belmont, CA: Brooks/Cole-Thomson Learning
2003
Pg. 26:
A rather clever person once said, “Biology is the only science in which multiplication means the same as division.” Explain this statement.
Answer: The division referred to in this statement is cell division, which multiplies the number of cells, and so multiplication = division.

Google BooksGaither’s Dictionary of Scientific Quotations
Edited by Carl C. Gaither and Alma E. Cavazos-Gaither
New York, NY: Springsr
2012
Pg. 285:
Biology is the only science in which multiplication means the same thing as division.
Source undetermined

Business Insider16 Jokes That Only A Biologist Will Get
KELLY DICKERSON
SEP. 9, 2013, 10:58 AM
(...)
2. Biology is the only science in which multiplication is the same thing as division.
Explanation: In biology, cells multiply in number when one cell divides into two.